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Proportion of oropharyngeal (panel A) and head and neck (panel B) squamous cell carcinoma (HNSCC) that are caused by HPV in North America and Europe. Only studies with more than 25 oropharynx (panel A: 27 studies)2, 5–13 or 50 HNSCC (panel B: 30 studies)5–9, 11, 14–16 cases were included.
